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#include<stdio.h> #include<conio.h> int main() { int i, n; long P; i = 1; P = 1; do { printf("\nNhap n: "); scanf("%d", &n); if(n < 1) { printf("\nN phai lon hon hoac bang 1. Xin nhap lai !"); } }while(n < 1); while(i < n) { P = P * i; i++; } printf("\nTich 1x2x....x%d la: %ld", i, P); getch(); return 0; }
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